Datasheet LTM4641 (Analog Devices) - 2

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Table oF conTenTs Features ... 1 Applications Information—Load Protection Applications .. 1 Features ..32 Typical Application .. 1
Overcurrent Foldback Protection ..32
Description.. 1
Power Good Indicator and Latching Output
Absolute Maximum Ratings .. 3
Overvoltage Protection ...32
Order Information .. 3
Power-Interrupt MOSFET (MSP), CROWBAR Pin
Pin Configuration .. 3
and Output CROWBAR MOSFET (MCB) ..33
Electrical Characteristics ... 4
Fast Output Overvoltage Comparator Threshold ...34
Typical Performance Characteristics ... 8
The Switching Node: SW Pin ..35
Pin Functions ..10 Applications Information—EMI Performance ..35 Simplified Block Diagram ...15 Applications Information—Multimodule Decoupling Requirements ...15 Parallel Operation ..36 Operation...16 Applications Information—Thermal Considerations
Introduction .. 16
and Output Current Derating ..38
Motivation ... 16 Thermal Considerations and Power µModule Regulator Reliability .. 16 Output Current Derating ...38 Overview ... 16
Applications Information—Output Capacitance Applications Information—Power Supply Features .17 Table ..45
Power (VINH) and Bias (VINL) Input Pins ... 17
Applications Information—Safety and Layout
Switching Frequency (On Time) Selection and
Guidance ...46
Voltage Dropout Criteria (Achievable VIN-to-VOUT Safety Considerations ...46 Step-Down Ratios).. 18 Layout Checklist/Example ..46 Setting the Output Voltage; the Differential
Typical Applications ..48
Remote Sense Amplifier ...21
Appendices ..56
Input Capacitors ...23 Appendix A. Functional Block Diagram and Output Capacitors and Features Quick Reference Guide ...56 Loop Stability/Loop Compensation ...23 Appendix B. Start-Up/Shutdown State Diagram ...57 Pulse-Skipping Mode vs Appendix C. Switching Frequency Considerations Forced Continuous Mode ... 24 and Usage of RfSET ...58 Soft-Start, Rail-Tracking and Start-Up Into Appendix D. Remote Sensing in Pre-Bias .. 24 Harsh Environments ...59 INTVCC and DRVCC ...27 Appendix E. Inspiration For Pulse-Skipping 1VREF ...28 Mode Operation ..60 TEMP, OTBH and Overtemperature Protection ..28 Appendix F. Adjusting the Fast Output Overvoltage Input Monitoring Pins: UVLO, IOVRETRY, OVLO ..29 Comparator Threshold ..60
Applications Information—Input Protection Package Description ...63 Features ..29 Package Photo ..63
Start-Up/Shutdown and Run Enable;
Package Description ...64
Power-On Reset and Timeout Delay Time ...31
Revision History ..65 Typical Application ...66 Related Parts ..66
4641fe 2 For more information www.linear.com/LTM4641 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information—Power Supply Features Applications Information—Input Protection Features Applications Information—Load Protection Features Applications Information—EMI Performance Applications Information—Multimodule Parallel Operation Applications Information—Thermal Considerations and Output Current Derating Applications Information—Output Capacitance Table Applications Information—Safety and Layout Guidance Typical Applications Appendices Package Description Package Photo Package Description Revision History Typical Application Related Parts